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Esco Heating 208 Questions & Answers: A Comprehensive Guide for HVAC Technicians, Exams of Refrigeration and Air Conditioning

Minneapolis Community and Technical CollegeRefrigeration and Air Conditioning

A comprehensive set of 208 multiple-choice questions and answers covering various aspects of gas furnace installation, operation, and maintenance. It is designed to help hvac technicians prepare for certification exams or enhance their knowledge of gas furnace systems. The questions cover topics such as gas pressure, vent systems, ignition systems, safety procedures, and troubleshooting common furnace problems.

Typology: Exams

2024/2025

Available from 02/20/2025

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1 | P a g e
Esco Heating 208 Questions & 100% Verified
Answers | Latest Update | Already Graded A+
1. A gas furnace is to be installed in a garage. The burners and ignition sources must be
located ______ above the floor.
A: 6 inches
B: 12 inches
C: 18 inches
D: 24 inches
๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ: C: 18 inches
2. A good description of how hi-metai fan switch operates the blower motor on a gas
furnace is:
A: temperature on - time off.
B: temperature on - time on.
C: temperature on- temperature off.
D: time on - time off.
๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ: C: temperature on- temperature off
3. Redundant gas valves used on gas furnaces will shut down if gas pressure exceeds:
pf3
pf4
pf5
pf8
pf9
pfa
pfd
pfe
pff
pf12
pf13
pf14
pf15
pf16
pf17
pf18
pf19
pf1a
pf1b
pf1c
pf1d
pf1e
pf1f
pf20
pf21
pf22

Partial preview of the text

Download Esco Heating 208 Questions & Answers: A Comprehensive Guide for HVAC Technicians and more Exams Refrigeration and Air Conditioning in PDF only on Docsity!

Esco Heating 208 Questions & 100% Verified

Answers | Latest Update | Already Graded A+

  1. A gas furnace is to be installed in a garage. The burners and ignition sources must be located ______ above the floor. A: 6 inches B: 12 inches C: 18 inches D: 24 inches ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : C: 18 inches
  2. A good description of how hi-metai fan switch operates the blower motor on a gas furnace is: A: temperature on - time off. B: temperature on - time on. C: temperature on- temperature off. D: time on - time off. ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : C: temperature on- temperature off
  3. Redundant gas valves used on gas furnaces will shut down if gas pressure exceeds:

A: 30.5 in. W.C. B: 60.5 in. W.C. C: 10.5 in. W.C. D: 13.5 in. W.C. ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : D: 13.5 in. W.C.

  1. Burning one cubic foot of Liquefied Petroleum gas completely will produce approximately ____BTU's. A: 2,000 - 2, B: 1,500-2. C: 1,200-1, D: 900-1, ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : A
  2. LP gas has a specific gravity of: A: .4-. B: 1.0-1. C: 1.5-2. D: 2.5 - 3. ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : C: 1.5-2.
  3. What is the purpose of a spoiler screw located on a burner? A: Mix combustion and dilution air

B: turn the thermostat off. C: turn the gas to the furnace off. D: All of the above. ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : D: All of the above.

  1. A natural gas (standing pilot) furnace usually requires ____gas pressure at the manifold and burners. A: 3.5 in- W.C. B: 4.2 in. W.C. C: 5.0 in, W.C. D: 7.0 in. W.C. ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : A: 3.5 in- W.C.
  2. The vent system for a condensing furnace is classified as ______by the National Field Gas Code. A: Category I B: Category II C: Category III D: Category IV ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : D: Category IV
  3. Type B vent pipe mast he kept at least _____from combustible materials. A: one eighth inch

B: one quarter inch C: one half inch D: one inch ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : D: one inch

  1. All condensing furnaces manufactured after 1992 must have an AFUE rating ot at least: A: 80% B: 86% C: 90% D: 96% ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : C
  2. The ignition temperature of LP gas is: A: 500ยฐF - 600ยฐF B: 600ยฐF-800ยฐF C: 800dF - 1000ยฐF D: 1000ยฐF - 1200ยฐF ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : D
  3. You have installed a Category IV two-pipe vent system that terminates through the roof of the residence. The elbow for the combustion air intake should: A: come straight out.

C: 280ยฐF - 300ยฐF

D: 100ยฐF - 120ยฐF

๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : C

  1. The proper chemical name for natural gas is: A: Methane B: Propane C: Butane D: Octane ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : A
  2. Burning one cubic foot of natural gas will produce _____BTU's A; 2000- 2500 B: 1,500 - 2. C: 1.200-1, D: 900-1, ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : D
  3. Natural gas has a specific gravity of: A: ,4-. B: 1.0 - 1. C: 1.5-2. D; 2.5 - 3.

๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : A

  1. A BTU is the amount of heat required to raise the temperature of one pound of water: A: one degree centigrade. B: one degree Fahrenheit C: one degree Celsius. D: one degree Kelvin. ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : B
  2. Natural gas piping must be sized to prevent excessive pressure drops. The National Fuel Gas Code maximum pressure drop allowance is approximately: A: .20 in. W.C. B: .35 in. W.C. C: .50 in. W.C. D: 1.5 in. W.C. ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : C
  3. Gas piping must he installed with a pitch of: A; 1" per 15' run. B: 1/2" per 15'run. C: 1/3" per 15' run. D: 1/4" per 15' run.

๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : B

  1. The ignition temperature of Natural Gas b A: 500ยฐF - 600ยฐF B: 600ยฐF - 800ยฐF C: 800ยฐF - 1000ยฐF D: 1000ยฐF - 1200ยฐF ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : D
  2. Air that is mixed with Natural Gas in the burner is called: A; primary air. B: combustion air. C; excess air. D: dilution air. ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : A
  3. A Natural Gas furnace is operating properly. How many cu. ft. of flue gas are needed for every one cu. ft. burned? A: 5 cu. ft. B: 10 cu. ft. C: 20 cu. ft. D: 30 cu. ft. ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : B
  1. The purpose of a flue baffle is: A: replace vent fans. B: control air to the burner C: slow down excess air. D: better furnace drafting. ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : C
  2. A redundant gas valve will have some type of vent limiting orifice. What is Its purpose? A: Decrease regulation pressure safety. B: Increase regulation pressure safety. C: Regulation and proper safe operation. D: Proper operation in high altitude locations. ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : C
  3. The LP gas pressure supplied to the gas valve should be: A: 2-4 in. W.C. B; 4-6 in. W.C. C: 7-9 in. W.C. D: 11-13 in. W.C ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : D

A: controls manifold pressure. B: controls air to burner. C: controls gas to burner. D: controls vent fan cycling. ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : C

  1. A good thermocouple should read approximately ___on a D.C. meter. A: 12 volts B: 24 volts C: 18 millivolts D: 250 millivolts ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : C
  2. Liquefied petroleum, (LP) gases are: A: butane and methane. B: propane and butane. C: butane, methane, and air. D; propane, methane, and air. ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : B 40.Fan time/temperature delay switches are used on gas furnaces to: A: allow the vent to create proper draft. B: remove condensation from the manifold.

C: allow the heat exchanger to warm up. D: Both "A" and "C" ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : C

  1. What instrument would a technician use to calculate return airflow to a furnace? A: Anemometer. B: Velometer. C: Draft gauge. D: Megger. ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : A
  2. A furnace with a hot surface igniter will not light. Before changing the igniter the technician should: A: check for cracks. B: check voltage to igniter. C: check for loose wires. D: All of the above. ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : D
  3. A technician starts a standing pilot furnace and notices, on main igntion, the flames "roll out". The technician suspects: A; high gas pressure. B; low gas pressure.

A: Fan on 125ยฐF / Fan off 110ยฐF / Limit cut out 200ยฐF. B: Fan on 125ยฐF / Fan off 80ยฐF / Limit cut out 200ยฐF. C: Fan on 95ยฐF / Fan off 110ยฐF / Limit cut out 250ยฐF. D: Fan on 95ยฐF / Fan off 80ยฐF / Limit cut out 250ยฐF ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : B

  1. A gas furnace with an induced draft blower is classified as ___by the National Fuel Gas Code. A: Category I B: Category II C: Category III D: Category IV ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : C
  2. Type B Vent pipe is constructed with an inner pipe and outer pipe.The inner pipe is made of: A: stainless steel. B: galvanized steel. C: aluminum. D: black iron ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : C
  3. On a dedicated vent system, a fire stop support plate is located:

A: after an adjustable elbow. B: between flashing and the vent cap. C: above Type B metal vent. D: where it passes through a ceiling. ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : D

  1. When venting Category I furnaces, it is sometimes necessary to increase the vent pipe size. The proper location to adapt to the larger vent is: A: at the furnace connection. B: one foot above the furnace connection. C: two feet above the furnace connection. D: three feet above the furnace connection. ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : C
  2. You are installing 1/2" and 3/4" black iron pipe to a natural gas furnace. What is the approximate number of threads to cut? A: 5- 6 B: 7- 10 C: 8- 9 D: 10- 11 ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : B
  3. The proper name of the tool used to cut the threads of a steel pipe is a:

B: S connectors and drive clips. C: Snap connectors and expansion sleeves. D: Snap connectors and wedge sleeves. ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : B

  1. Metal ductwork tends to transmit noise and fan vibratians to conditioned space in residential installations. What type of connectors are specified to control this? A: Damper eliminating brackets B. Plastic hangers C Vapor barriers D: Flex connectors. ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : D
  2. Duct wrap is used to insulate round metal ducts. What is the approximate R-value for one inch of this insulation? A: R-1. B: R-2. C: R-4. D : R-6. ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : C: R-4.
  3. A "Category 1" natural gus furnace has a typical air temperature rise of: A: 40ยฐF-50ยฐF

B: 40ยฐF-70ยฐF

C: 60ยฐF-100ยฐF

D: 60ยฐF-120ยฐF

๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : C

  1. A technician connects the electrical circuit to 80,000 BTU gas furnace with a 3-ton cooing system. The fan motor is rated 1/3 HP @ 120 VAC. What size copper conductor would normally be used? A: 10-12AWG B: 12-14AWG C: 14-16AWG D: 16-18AWG ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : B
  2. A GFCI circuit breaker detects: A: Current leaks to ground. B: voltage drop at the appliance. C. AC&DC voltages at the appliance. D: impedance at the appliance. ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : A 61.The National Electrical Code Classification for thermostat wire is: A: NEC Class l